Data driver and organic light emitting display device including the same

Abstract

Data drivers and organic light emitting display devices having data drivers are provided in which a number of amplifiers for driving a display panel is reduced. A data driver includes an analog-to-digital converter, first and second amplifier circuits, a first switch coupled to an output of the first amplifier circuit, and a second switch and a third switch coupled to an output of the second amplifier circuit. The first switch is configured to selectively couple the output of the first amplifier circuit to a first data line and to second data line of a display panel. The second switch is configured to selectively couple the output of the second amplifier circuit to the second data line and to the analog-to-digital converter. The third switch is configured to selectively couple the output of the second amplifier circuit to a sensing line of the display panel.

The invention claimed is: 
     
       1. A data driver, comprising:
 an analog-to-digital converter; 
 a first amplifier circuit; 
 a first switch coupled to an output of the first amplifier circuit, the first switch configured to selectively couple the output of the first amplifier circuit to a first data line of a display panel and to selectively couple the output of the first amplifier circuit to a second data line of the display panel; 
 a second amplifier circuit; 
 a second switch coupled to an output of the second amplifier circuit, the second switch configured to selectively couple the output of the second amplifier circuit to the second data line and to selectively couple the output of the second amplifier circuit to the analog-to-digital converter; and 
 a third switch coupled to the output of the second amplifier circuit, the third switch configured to selectively couple the output of the second amplifier circuit to a sensing line of the display panel 
 wherein in a sensing driving mode, the output of the first amplifier circuit corresponds to a sensing data voltage to be supplied to a first pixel and a second pixel of the display panel, and the output of the second amplifier circuit corresponds to a reference voltage to be supplied to the first and second pixels, or sensing results of the first and second pixels according to a difference between the sensing data voltage and the reference voltage, and 
 wherein the first pixel is connected to the first data line and the sensing line, and the second pixel is connected to the second data line and the sensing line. 
 
     
     
       2. The data driver of  claim 1 , further comprising:
 a base power supply circuit; 
 a fourth switch coupled between the base power supply circuit and the first data line; and 
 a fifth switch coupled between the base power supply circuit and the second data line. 
 
     
     
       3. The data driver of  claim 2 , wherein the base power supply circuit is configured to supply a pixel off voltage for turning off a pixel current in a pixel connected to the first data line or the second data line. 
     
     
       4. The data driver of  claim 1 , wherein the first amplifier circuit includes:
 a first amplifier having an inverting input, a non-inverting input, and an output, the inverting input being connected to the output; and 
 a first digital-to-analog converter connected to the non-inverting input of the first amplifier. 
 
     
     
       5. The data driver of  claim 4 , wherein the second amplifier circuit includes:
 a second amplifier having an inverting input, a non-inverting input, and an output; 
 a second digital-to-analog converter connected to the non-inverting input of the second amplifier; and 
 a feedback capacitor connected between the inverting input and the output of the second amplifier. 
 
     
     
       6. The data driver of  claim 5 , wherein the inverting input of the second amplifier is connected to the sensing line of the display panel. 
     
     
       7. A display device, comprising:
 a display panel including:
 a first pixel circuit; 
 a second pixel circuit adjacent to the first pixel circuit; 
 a first data line connected to the first pixel circuit; 
 a second data line connected to the second pixel circuit; and 
 a sensing line connected to the first pixel circuit and the second pixel circuit; and 
 
 a data driver coupled to the display panel, the data driver including:
 a first amplifier circuit; and 
 a second amplifier circuit, 
 
 wherein the display device, in use, operates in a sensing driving mode and in a display driving mode, 
 wherein in the sensing driving mode:
 the first amplifier circuit outputs a sensing data voltage to the first data line during a first set-up period during sensing driving for the first pixel, and outputs the sensing data voltage to the second data line during a second set-up period during sensing driving for the second pixel, and 
 the second amplifier circuit outputs a reference voltage to the sensing line during the first set-up period and the second set-up period, outputs a first sensing result of the first pixel during a first sampling period during sensing driving for the first pixel, and outputs a second sensing result of the second pixel during a second sampling period during sensing driving for the second pixel. 
 
 
     
     
       8. The display device of  claim 7 , wherein, in the sensing driving mode, the first sampling period occurs after the first set-up period, the second set-up period occurs after the first sampling period, and the second sampling period occurs after the second set-up period. 
     
     
       9. The display device of  claim 7 , wherein in the display driving mode:
 the first amplifier circuit outputs a first display data voltage to the first data line, and 
 the second amplifier circuit outputs a second display data voltage to the second data line. 
 
     
     
       10. The display device of  claim 9 , wherein, in the display driving mode, the second amplifier circuit outputs the second display voltage to the second data line at a same time as the first amplifier circuit outputs the first display data voltage to the first data line. 
     
     
       11. The display device of  claim 9 , wherein the data driver further includes:
 an analog-to-digital converter; 
 a first switch coupled to the output of the first amplifier circuit, the first switch selectively couples the output of the first amplifier circuit to the first data line during the first set-up period and in the display driving mode, and selectively couples the output of the first amplifier circuit to the second data line during the second set-up period; 
 a second switch coupled to the output of the second amplifier circuit, the second switch selectively couples the output of the second amplifier circuit to the analog-to-digital converter during the first sampling period and the second sampling period, and selectively couples the output of the second amplifier circuit to the second data line in the display driving mode; and 
 a third switch coupled to the output of the second amplifier circuit, the third switch selectively couples the output of the second amplifier circuit to the sensing line during the first set-up period and the second set-up period. 
 
     
     
       12. The display device of  claim 11 , further comprising:
 a base power supply circuit configured to supply a pixel off voltage for turning off a pixel current in the first pixel circuit or the second pixel circuit; 
 a fourth switch coupled between the base power supply circuit and the first data line; and 
 a fifth switch coupled between the base power supply circuit and the second data line. 
 
     
     
       13. The display device of  claim 12 , wherein the fourth switch selectively couples the base power supply circuit to the first data line during the second set-up period and the second sampling period, and the fifth switch selectively couples the base power supply circuit to the second data line during the first set-up period and the first sampling period. 
     
     
       14. The display device of  claim 7 , wherein the first amplifier circuit includes:
 a first amplifier having an inverting input, a non-inverting input, and an output, the inverting input being connected to the output; and 
 a first digital-to-analog converter connected to the non-inverting input of the first amplifier. 
 
     
     
       15. The display device of  claim 14 , wherein the second amplifier circuit includes:
 a second amplifier having an inverting input, a non-inverting input, and an output; 
 a second digital-to-analog converter connected to the non-inverting input of the second amplifier; and 
 a feedback capacitor connected between the inverting input and the output of the second amplifier. 
 
     
     
       16. The display device of  claim 15 , wherein the inverting input of the second amplifier is connected to the sensing line. 
     
     
       17. The display device of  claim 11 , further comprising:
 a driver integrated circuit (IC) coupled to the display panel, wherein the driver IC includes the data driver; and 
 a compensation integrated circuit (IC) coupled to the driver IC, the compensation IC being configured to receive digital sensing data output by the data driver, and correct image data received from a host system based on the digital sensing data. 
 
     
     
       18. The display device of  claim 17 , wherein the data driver further includes:
 a base power supply circuit configured to supply a pixel off voltage for turning off a pixel current in the first pixel circuit or the second pixel circuit; 
 a fourth switch coupled between the base power supply circuit and the first data line; and 
 a fifth switch coupled between the base power supply circuit and the second data line. 
 
     
     
       19. A data driver, comprising:
 a first amplifier circuit selectively coupleable to a first data line of a first pixel and to second data line of a second pixel; and 
 a second amplifier circuit selectively coupleable to the second data line and to a sensing line, 
 wherein the data driver is operable in a sensing driving mode and in a display driving mode, 
 wherein in the sensing driving mode: 
 the first amplifier circuit outputs a sensing data voltage to the first data line during a first set-up period during sensing driving for the first pixel, and outputs the sensing data voltage to the second data line during a second set-up period during sensing driving for the second pixel, and 
 the second amplifier circuit outputs a reference voltage to the sensing line during the first set-up period and the second set-up period, outputs a first sensing result of the first pixel during a first sampling period during sensing driving for the first pixel, and outputs a second sensing result of the second pixel during a second sampling period during sensing driving for the second pixel. 
 
     
     
       20. The data driver of  claim 19 , wherein each of the first amplifier circuit and the second amplifier circuit includes only one amplifier.